Investment Objectives and Goals - BlackRock Retirement Income 2030 Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock Retirement Income 2030 Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock Retirement Income 2030 Fund (the “Fund”), a series of BlackRock Funds II (the “Trust”), is to seek to maximize current income while decumulating the Fund’s assets to a predefined target Fund net asset value per share, as a percentage of the Fund’s net asset value per share at inception, over the term of the Fund.
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